Reduced connectivity between mentalizing and mirror systems in autism spectrum condition

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Developmental Neuroscience

Background:

• Mentalizing, the ability to infer others' mental states, is crucial for social interaction.
• Individuals with autism spectrum condition (ASC) often exhibit challenges with mentalizing.
• The interplay between the mentalizing system and the mirror system is implicated in social cognition.

Purpose of the Study:

• To investigate if altered functional connectivity between the mentalizing and mirror systems underlies mentalizing deficits in adults with ASC.
• To examine the relationship between brain connectivity, task performance, and autistic traits.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to monitor brain activity in 20 adults with ASC and 20 typically developing adults.
• Participants viewed videos of hand actions, performing either a mentalizing task (judging intent) or a non-mentalizing task (judging outcome).
• Functional connectivity analyses assessed the communication between brain regions during the tasks.

Main Results:

• Typically developing individuals showed increased functional connectivity between the dorsal medial prefrontal cortex (dmPFC) and the mirror system during mentalizing.
• Adults with ASC did not exhibit this increased functional connectivity.
• Reduced dmPFC-mirror system connectivity in ASC participants correlated with poorer behavioral performance and higher autistic traits.

Conclusions:

• Functional connectivity between the mentalizing and mirror systems is vital for inferring social intentions.
• Reduced connectivity between these systems may contribute to the social-communication difficulties observed in adults with ASC.
• These findings highlight a potential neural mechanism for mentalizing impairments in autism spectrum condition.